76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
|
/*
|
||
|
|
* ACM demuxer
|
||
|
|
* Copyright (c) 2015 Paul B Mahol
|
||
|
|
*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "libavutil/intreadwrite.h"
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "rawdec.h"
|
||
|
|
#include "internal.h"
|
||
|
|
|
||
|
|
static int acm_probe(const AVProbeData *p)
|
||
|
|
{
|
||
|
|
if (AV_RB32(p->buf) != 0x97280301)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return AVPROBE_SCORE_MAX / 3 * 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int acm_read_header(AVFormatContext *s)
|
||
|
|
{
|
||
|
|
AVStream *st;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
st = avformat_new_stream(s, NULL);
|
||
|
|
if (!st)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
||
|
|
st->codecpar->codec_id = AV_CODEC_ID_INTERPLAY_ACM;
|
||
|
|
|
||
|
|
ret = ff_get_extradata(s, st->codecpar, s->pb, 14);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
st->codecpar->channels = AV_RL16(st->codecpar->extradata + 8);
|
||
|
|
st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10);
|
||
|
|
if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
st->start_time = 0;
|
||
|
|
st->duration = AV_RL32(st->codecpar->extradata + 4) / st->codecpar->channels;
|
||
|
|
st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
|
||
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
FF_RAW_DEMUXER_CLASS(acm)
|
||
|
|
AVInputFormat ff_acm_demuxer = {
|
||
|
|
.name = "acm",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"),
|
||
|
|
.read_probe = acm_probe,
|
||
|
|
.read_header = acm_read_header,
|
||
|
|
.read_packet = ff_raw_read_partial_packet,
|
||
|
|
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
|
||
|
|
.extensions = "acm",
|
||
|
|
.raw_codec_id = AV_CODEC_ID_INTERPLAY_ACM,
|
||
|
|
.priv_data_size = sizeof(FFRawDemuxerContext),
|
||
|
|
.priv_class = &acm_demuxer_class,
|
||
|
|
};
|